So you actually think that the value of money is based on a social illusion. This line of reasoning has many flaws. Most importantly, it severely contradicts the empirical evidence that the purchasing power of money is very stable - at least in developed countries, where basic rules of modern banking are implemented stringently. The constant and gradual loss of purchasing power - inflation - is hardly explained with a "social illusion". A good theory must explain reality, and in reality payments are made with money. Wages are paid with money. To make it very clear: Stating that the value of money rests on a social illusion means surrendering economic theory to sociology or psychology. But you yourself have stated that economics is a science in its own right. You are therefore contradicting yourself.

What would you think, for example, if a chemist told you that "an atom is what society thinks is an atom", or if a physicist stated that "gravity is whatever society believes gravity to be". Indeed, not an ideal starting position for any serious research! What is ridiculous for all other scientists must be ridiculous for an economist. Therefore, if we want to understand the real world - in which payments are very obviously made with the use of money - we must understand what money is.

For these reasons, the idea that money's value is just an illusion cannot be accepted on purely scientific grounds. Money's value is a reality and it must be explained scientifically. Therefore, go back to the last question.